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The Emergence of Shell Valuable Exchange in the New Guinea Highlands

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The Emergence of Shell Valuable Exchange in the New Guinea Highlands View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Apollo The Emergence of Shell Valuable Exchange in the New Guinea Highlands Dylan Gaffney, Glenn R. Summerhayes, Katherine Szabo, and Brent Koppel ABSTRACT Shell valuable exchange in the New Guinea Highlands has been a key interest in anthropology, providing insight into economics, aesthetics, and social stratification amongst banded communities. This paper describes how shell exchange at ethnographic present reflects deeper historical processes. We trace the origins and subsequent changes in shell use from the terminal Pleistocene to the Late Holocene at the site of Kiowa in Chimbu Province, Papua New Guinea. Zooarchaeological and technological analyses of Kiowa’s shell artifacts indicates riverine mussel was procured locally from the terminal Pleistocene (9,500–10,000 years ago) and featured as a minor component in the diet into the recent precolonial period. In contrast, evidence for marine shell valuables only appears in the Late Holocene in the form of Trochus armbands and Tegillarca granosa and Polymesoda cf. erosa multifunctional tools. This challenges ideas that associate the gradual dispersal of marine shell into the highlands with the spread of agriculture around the Wahgi Valley at the start of the Holocene, and supports punctuated pulses of coastal contact. In doing so, we formulate a testable model for the development of shell exchange into the highlands, with implications for the emergence of stratification and the conduits between the interior and coast. [shell valuables, trade and exchange, coastal contact, stratification, New Guinea Highlands] RESUMEN El intercambio valioso de conchas en la zona montañosa de la Nueva Guinea ha sido un interés clave en antropología, proveyendo conocimiento en la economía, la estética y la estratificación económica entre las comunidades congregadas. Este artículo describe cómo el intercambio de conchas en el presente etnográfico refleja procesos históricos más profundos. Trazamos los orígenes y los cambios subsecuentes en el uso de conchas desde el Pleistoceno terminal al Holoceno tardío en el sitio de Kiowa en la provincia de Chimbu, Papúa Nueva Guinea. Los análisis zooarquelógicos y tecnológicos de artefactos de conchas en Kiowa indican que el mejillón fluvial se obtuvo localmente desde el Pleistoceno terminal (9.500– 10.000 años atrás) y se incluyó como un componente menor en la dieta en el período precolonial reciente. En contraste, la evidencia de objetos de valor de las conchas marinas sólo aparece en el Holoceno tardío en la forma de brazaletes de Trochus y herramientas multifuncionales de Tegillarca granosa y Polymesoda cf. erosa. Esto reta ideas que asocian la dispersión gradual de las conchas marinas en la zona montañosa con la expansión de la agricultura alrededor del Wahgi Valley al principio del Holoceno, y apoya pulsos intermitentes de contacto costero. De este modo, formulamos un modelo comprobable para el desarrollo del intercambio de conchas en la zona montañosa, con implicaciones para la emergencia de estratificación y los conductos entre el interior y la costa. [objetos de valor de conchas, comercio e intercambio, contacto costero, estratificación, Zona montañosa de Nueva Guinea] When the Leahy Brothers first trekked into the deeply corrugated valley systems of the Central New Guinea Highlands in 1930, they were struck by the large marine shell valuables worn by communities who were thought to be isolated from the coast (Leahy 1936). Since then, anthropologists have concerned themselves with tracing the networks and interrelationships that allowed these shells to work their way up into the interior of the island (e.g., Harding 1967; Hughes 1977; Sillitoe 1979). As such, the subject occupies an important place in the history and theoretical modeling of the discipline. Especially in relation to the economics and politics of exchange valuables. Archaeological anthropologists have also debated the timing, nature, and intensity of earlier forms of shell valuable exchange in the precolonial past (Swadling 1994; White 1972). The histories of these shell valuable exchanges are significant to anthropological understandings of trade and cultural history for two main reasons. Firstly, because the introduction of marine shells into the Highlands economy, even in small numbers, may have had important historical consequences in terms of the process and tempo of trade and exchange, along with the nature of social organization, leading to the highly sophisticated exchange networks and low-level stratification characteristic of the ethnographic period. Secondly, because marine shell is direct evidence for connectivity between the coast and the interior, it is a proxy to build interpretations about the movement and flow of goods, ideas, and perhaps people between the coast and the Highlands, with implications for the translocation of coastally adapted crops into montane environments starting in the Early Holocene, 10,000 years ago, and punctuations to Highlands economics around the Mid-Late Holocene. Little is known about shell valuable exchange prior to the nineteenth century. Vial (1940) asserted that the number of shells entering the Highlands economy each year prior to European contact must have been small. However, it is not known what role these shell valuables played in Highlands society. Could shell objects have been even more important in the past for signifying prestige due to their rarity—as Vial (1940) further notes, the value of shells fell in the colonial period as stocks increased—or did they hold little more than personal value for adornment or as tools? We present one line of archaeological evidence for the development of shell use and exchange in the New Guinea Highlands, excavated from the rockshelter site of Kiowa in the Chimbu province (Figure 1). Although this assemblage is limited in number, it is highly informative, containing some of the only marine shell artifacts from a Highlands archaeological site. Using the Kiowa data, we ask: When did marine shells enter into the Highlands economies? Did the material become available at different times in different areas? And how did this inform social organization and exchange relationships? The evidence demonstrates that, although pearlescent riverine mussel was procured locally for subsistence since the terminal Pleistocene, there is no evidence for marine shell exchange at the site until the Late Holocene, from around 1,000 years ago. We posit that marine shell valuables were not a major component of the wider Highlands trade system until very recently and that the explanation for their importance is not exclusively linked to aesthetic values or to availability, but to unique, historically contingent mutations to power relationships and interaction networks that came to fruition in the last millennium. In doing so, we then build a tentative model for the origins and historical process of shell exchange around the Highlands, with implications for social organization and connections with the coast. This model stresses local variation as opposed to a singular evolutionary development. It also lends further support to the recent origins of incipient stratification in the Highlands in the form of “big-men.” As shell valuables have been used at various times and in many parts of the planet (Trubitt 2003), examining the variable histories of this material in New Guinea might be useful for informing broader anthropological concerns about changing trade and exchange within small- scale communities, and about how the materials of this exchange inform stratification and social interrelationships. [FIGURE 1 ABOUT HERE] The Anthropology of Exchange Valuables All human groups have a propensity for ranking materials by “value” (Gregory 1982), also known as hierarchies of esteem (G. Clark 1986). Graeber (2001) argues the value of objects reflects commoditized labor and the proportion of total pooled work invested in that object. “Valuables” are then representations of specific action and motivate new forms of action, often in accordance with the characteristics associated with that object. For instance, objects that denote high status symbolize actions associated with achieving that status and encourage others to act in accordance with these characteristics. The locally peculiar ways of ranking different valuables may reflect resource scarcity or formal and informal measures of esteem within specific value networks operating within broader society (Gudeman 1986; cf. Graeber 2013). The exchange of valuable objects materializes social relationships (Thomas 1991, 7) and strengthens connections within these value networks. Within hierarchies of esteem, often some of the most highly prized items are exotic, with restricted availability, and require exchange for procurement. Exotic exchange valuables, in particular, can be used to entice others into reciprocal relationships due to their rarity (Gosden 1989). For instance, in coastal Papua New Guinea, small and highly desirable objects like worked shell or obsidian would be added to bulk trades of practical objects, such as subsistence crops, to make the exchanges more appealing and to maintain reciprocal trade deals, essential for the survival of the trading groups (Harding 1967; Mager 1952, 128). The production (or not) of specific objects could also be deliberate, whereby different groups would focus on making specific, highly sought-after products to encourage and maintain exchange
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